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To get the Greates Common Factor (GCF) of 434 and 234 we need to factor each value first and then we choose all the copies of factors and multiply them:
|434: ||2|| || ||7|| ||31|
|234: ||2||3||3|| ||13|| |
|GCF: ||2|| || || || || |
The Greates Common Factor (GCF) is: 2